Method of manufacturing fiber-reinforced resin pipe

Abstract

A method of manufacturing a fiber-reinforced resin pipe which including the steps of forming a plurality of layers by alternately winding a cloth-like material and a continuous fiber on a core. Placing the core in a split type outer mold having an inner surface which forms a desired outer surface of the pipe. Injecting a liquid synthetic resin between the outer mold and the core so that the liquid resin is integrated with the layers and cured into a molded product. Removing the molded product from the outer mold after the resin has cured and removing the core form the molded product.

What is claimed is: 
     
       1. A method of manufacturing a fiber-reinforced resin pipe comprising the steps of: forming a plurality of layers by alternately winding a readily impregnated thin loose cloth-like material, in the form of a loose cloth having a thickness of 0.1 to 0.5 mm and a density of 20 to 100 g/m 2 , and a continuous fiber on a core;   placing said core with said layers formed thereon within a split type outer mold having an inner surface which forms a desired outer surface of said pipe;   injecting a liquid synthetic resin at a pressure in a range of 1 to 2 Kg force/cm 2  between said outer mold and said core so that said liquid resin is integrated with said layers and cured into a molded product; and then   removing said molded product from said outer mold and removing said core from said molded product.   
     
     
       2. A method as set forth in claim 1, wherein the cloth-like material is a loose cloth having a thickness of 0.1 to 3.0 mm and a density of 20 to 50 g/m 2 . 
     
     
       3. A method as set forth in claim 1, wherein the continuous fiber is wound on the core with a winding tension of 200 to 1000 gf per one roving. 
     
     
       4. A method as set forth in claim 1, wherein the continuous fiber is one selected from the group consisting of glass roving and carbon roving. 
     
     
       5. A method as set forth in claim 1, wherein the resin is one selected from the group consisting of thermosetting resins. 
     
     
       6. A method as set forth in claim 1, wherein a thickness of the layers wound on the core is reduced at one end thereof so that a space for injecting the resin is provided between the outer surface of the layers and the outer mold, the resin being injected through the space. 
     
     
       7. A method as set forth in claim 1, wherein the resin is injected between the outer mold and the core through an opening provided at the center of the outer mold. 
     
     
       8. Method of claim 1 wherein the continuous fiber is wound at a winding angle of about 30 degrees. 
     
     
       9. Method of claim 1 wherein the uppermost and lowermost layers formed on the core are of the cloth-like material. 
     
     
       10. Method of manufacturing a fiber-reinforced resin pipe comprising the steps of: forming a plurality of layers by alternately winding a readily impregnated thin loose cloth-like material, in the form of a loose cloth having a thickness of 0.1 to 0.5 mm and a density of 20 to 100 g/m 2 , and a continuous fiber on a core, the continuous fiber being wound on the core at a winding angle of about 30 degrees, with a winding tension of 200 to 1000 gram force per one roving;   placing said core with said layers formed thereon within a split type outer mold having an inner surface which forms a desired outer surface of said pipe;   injecting a liquid synthetic resin at a pressure in a range of 1 to 2 Kg force/cm 2  between said outer mold and said core so that said liquid resin is integrated with said layers and cured into a molded product; and then   removing said molded product from said outer mold and removing said core from said molded product.   
     
     
       11. Method of claim 10 wherein the uppermost and lowermost layers formed on the core are of the cloth-like material.